BBM 7.24in Steel Harmonic Balancer

The Power Bond Balancers BBM 7.24-inch steel harmonic balancer (model PB1112N) is a precision-engineered crankshaft damper designed for internal balance Mopar RB-series engines. This cast iron balancer, finished in black paint, manages harmful vibration frequencies that develop at high RPM, extending engine life and improving overall driveability. The 7.100-inch outer diameter fits OEM specifications for direct fitment to compatible Mopar big-block applications.

Harmonic balancers work by absorbing torsional vibrations generated by the crankshaft firing cycle. A properly matched balancer—one that corresponds exactly to the internal balance weight of your specific engine—prevents the development of resonant frequencies that crack journals, loosen fasteners, and fatigue gasket seals. The PB1112N is engineered for Mopar RB-series blocks and must be paired with an internally balanced crankshaft assembly. Cast iron construction provides excellent damping characteristics while maintaining durability under sustained engine loading. At 7.07 pounds, this balancer delivers the rotational inertia necessary for stable harmonic control without excessive parasitic load.

Mopar RB-series engine builders and restorers rely on matched balancer specifications because using an incorrect balancer—whether externally balanced when the engine is internally balanced, or vice versa—introduces dangerous harmonic imbalances that accelerate component wear. This balancer is ideal for engine rebuilds, street performance applications, and classic Mopar restorations where OEM specifications matter. Verify internal balance status of your crankshaft before installation to ensure proper damping performance and engine longevity.